Rotary pump



May 17, 1932.

J. A. OLSON ROTARY PUMP Filed Feb. 2o, 1929 fxw /QTrDR/vex/ 2Sheets-Sheet l May A17,- `1932. J. @OLSON- 4,858,681

ROTARY PUMP Filed F'eb. 20, 1929 '2 Sheets-Sheet 2 Patented May 17,1932?` 4.UNrraD STATES JOHN OLSON, OF PORTLAND, OREGON ROTARY PUMPApplication led February 20, 1929. Serial No. 341,301.

This invention relates generally to high pressure pumps, 'and especiallyto pumps for handling cohesive and abrasive iiuids.

The main object of this invention 'is to provide a new form of pumpcapable of operating at high pressures over extended periods of timewithout showing undue deterioration from wear or from the action of thefluids being pumped. v

Thesecond object is to produce a rotary pump having balanced buckets,that is to say in which the buckets are so constructed as to balance thepressures on the opposite sides of same so as to minimize the frictionand wear on the contacting parts.

The third object is to produce a high pressure pump which will be freerunning due to the use of ball bearings, and which will have its ballbearings outside of its packings.

The fourth object is to construct a rotary vpump whose shaft is subjecttobending deflections, and which will not destroy the packing in thepump by reason of such deflections.

25 wearing parts are so constructed as to be easily renewed, and'inwhich the wear on these particular kparts is reduced to a minimum. f

These, and other objects, will become more apparent from thespecification following as illustrated in the accompanying drawings, inwhich:

Figure 1 is a longitudinal section through the pump. Figure 2 is atransverse section through the pump taken along the line 2-2 inFigure 1. Figure 3 is a perspective `7iew of a bucket. Figure 4 is aperspective view of the liner for the cylinder. Figure 5 is afragmentary internal view of the liner. Figure 6 is a-transverse sectionthrough the pump showing the positions of the various buckets as theytravel around the interior of the cylinder lining, with the cylinderomitted. Figure 7 is a side elevation of my new form of bucket in whicha portion of its area is exposed to the low pressure side.

Figure 8 is a diagram showing the areas affected by the variouspressures. Fig. 9 is The fifth object is to provide a pump whoseadiagrammatic view showing the forces acting upon the bucket.

Similar numbers of reference refer to similar parts throughout theseveral views.

Referring-in detail to the drawings, the pump itself consists of acylinder member 10 which is provided with a base 11 to which it can bebolted to a suitable support by means of the bolts 12. rlhe interiorsurface 13 of the cylinder '10is provided with a cylindrical liner 14having a group of holes 15 constituting outlet ports and a second groupof holes 16 constituting inlet ports.

Passing through the liner 14 is the pump shaft 17 which is eccentricwith relation to the liner 14 and journals inthe ball bearings 18 whichare positioned around the' reduced ends 19 of the shaft 17. The ballbearings 18 are mounted in the housings 20 whose flanges 21 are boltedagainst thev cover plate 22, which, in turn, bears against the side ofthe cylinder `10. The side 23 of the plate 22 projects a short distanceinto the housing 2O and forms a seat for one side 24 of a spring packingelement whose opposite side 25 bears against the face 26 of the housing20. The

face 26 is formed on an inturned flange 27 Which does not touch theshaft 17. y

Within the elements 24 and 25 are, the soft packing rings 28 which arecompressed against the side of the shaft by means of the spring 29 whoseends engage the washers 30.

It will be observed that the covervplate 22 Y isalso separated from theshaft 17, as is the flange 27, so that the entire shaft 17 floatsbetween the two opposite bearings 18.

' It will also be seen thatany deflection of the shaft 17 caused bylateral pressures eX- erted thereon will not affect the seal of thepacking elements. Since the elements 24 and 25 are rotatable withrelation to their contacting faces 23 and 26, as well as radiallymovable with relation thereto, the above mentioned deflections willmerely cause a departure from a true circular path, as far as theelements 24 and 25 are concerned, and since there is no relativemovement between the soft packing 28 and the shaft 17 there is clearlyno wear between these parts. A pervum fect seal is maintained at alltimes and the pressure with which the element 25 bears against the face26 is proportional to the pressure on the liquid' being confined by thepacking, as is well understood.

Within the housing 20 and against the inner sidevof each bearing 18 isan inturned felt ring flange 31, and secured on the outer end of eachhousing 20 is a felt ring retaining cap 32. The felt rings 33 serve tohold the lubricant toward that portion of the shaft 17 which isimmediately supported by the bearings 18.

Between the felt ring flange 31 and the flange 27 isan open space 34through which any leakage of oil or fluid handled by the pump may bedrawn away through the port 35..

The cylinder 10 of the pump is provided with two enlargements 36 and 37which start atthe shoulders 38 and 39 and terminate at the outletopening 40 and the inlet openings 41 respectively. The enlargement 36lies directly outside of the holes 15 and the enlargement 37 liesdirectly outside of the holes 16. An inlet pipe 42 connects with theinlet opening 41 by means of a flange 43.v The outlet pipe 44 isconnected at the outlet opening by means of the flange 45.

rlihe rotor 46 is cylindrical in form and secured to the shaft 17 bymeans of a key 47. The rotor 46 is also provided with cutout portions 48whose sides 49 are approximately radial. Adjacent to each face 49 andformed in the side of the rotor 46 are the recesses 50 which constituteclearance for the arms of the impellers or buckets about to bedescribed.

Passing through the rotor 46 and connecting opposite recesses 50 is apin 51 on which are mounted the arms 52 of the bucket 53 whose cutersurface 54 is an arc struck from thevcenter of the pin 51 whichpractically intersects an arc forming the inner side 55 of the `bucketat a point 56 where the bucket engages the interior of the liner 14. Inorder to balance the pressures on the bucket and prevent an undesirableoutward thrust, due to the added forces of centrifugal action andpressure being built up within the pump, it is desirabletoextend a li 57on the outer edge of the bucket on the side of the face 54, not only toincrease its wearing surface, but for a purpose which will be more fullyexplained hereafter.

rlhe face 58 of each recess 50 is concentric i `"with the face 54 and isprovided with a gravity, plus the centrifugal force,l plus the outwardfluid pressure exerted on the bucket (as shown in' Figure 7) will holdthe bucket in close-relation to the inner surface 61 of the liner 14.The cycle of operation as to suction and discharge positions, of thebuckets is quite similar to numerous existing devices of this character,which may be briefly stated as follows:

As a bucket travels in the direction indicated in Figure 6 as soon as itpasses the last intake opening 16 it will exert a direct pull againstall of the intake ports 16 in proportion to the'increasing area adjacentto the recess in which the'bucket is operating, constituting the suctionstroke of the bucket, and as soon as the point 56 of the bucket passesthe lowermost` portion of the liner 14, after which the operating spacebecomes more restricted, owing to the eccentric relation of the rotorand liner, there is set up a compressing action which forces the fluidahead of the bucket 53 t0 pass out'through the holes 15 and ultimatelythrough the pipe 44.

Itwill be noted in Figure 7 that by this construction there aredeveloped several -distinct and different pressure areas (as shownsomewhat diagrammatically in Figure 8) namely a relatively low outwardpressure area 62, a small area of higher outward pressure 63 and a largebalanced pressure area 64, the reasons for which balancing are set forthclearly in Figure 7.

lt is desirable'to provide a set screw 65 in the b ase l1 formaintaining the relation between the cylinder 10 and the lining 14.

lit will be noted in Figure 5 that there is shown the relativeproportions of the liner 14, the lip 57 and the holes 16. rlhere are twoobjects in making the holes 16 staggered and of small size andgreaterlnumbers than are usually employed, the first being to bettersupport vthe bucket in its rotation against the face 61, and the secondto reduce the effective port area presented to the bucket at any oneinstant. In other4 words, the problem of balancing the bucket is greatlysimplified by scattering the port areas over a relatively largeportion-of the circumference of the liner 14.

I claim: y. 3

1. In a'rotary pump the combination of a rotor casing having acylindrical lining mounted therein, a cylindrical rotor eccentricallymounted within said lining, said rotor having pockets formed in the sidethereof, each ofsaid pockets having an arcuate bucket hinged therein,the curves of said buckets being concentric with their axes, each ofsaid buckets having a radially outwardly extending lip formed along one;edge thereof adapted to en age the interior of said lining, a portion o?the trailing edge of llO said lip lying outside of the outermost curve'of said bucket.

sesl

2. A high pressure pum consisting of a. casing having inlet and outetports, a cylindrical lining mounted in said casing, a cylindricalrotor eccentrically mounted within said liner, said rotor having apluralit of pockets formed therein, the trailing si e of each pockethavin an arcuate surface, a bucket hinged withln each pocket having thearcuate side fitted to the trailing side of said pocket, said arcuatebucket side having a lining engaging lip on its rearward outermost edgethe maJor portion of which extends outside of the curvature of thebucket.

t JOHN A. OLSON.

